How to Change the Coolant in a 2023 Beta 390 RR

Shop parts for a 2023 Beta 390 RR Dirt Bike.

Maintaining the cooling system on your 2023 Beta 390 RR is essential for optimal engine performance and longevity. This proprietary MotoSport guide walks you step-by-step through changing your coolant, highlights model-specific considerations, and delivers key tips for a successful job.

Why Change the Coolant?

Over time, coolant degrades and loses its effectiveness at transferring heat and protecting the engine from corrosion. Changing it periodically ensures efficient engine cooling under demanding off-road conditions.

Tools and Supplies Needed

  • Fresh, high-quality motorcycle coolant (pre-mixed and suitable for aluminum engines, such as Engine Ice or Motul Motocool)
  • Basic hand tools (screwdrivers, sockets, pliers)
  • Drain pan
  • Clean funnel
  • Rags and gloves

Step-by-Step Coolant Change Process

  1. Ensure Safety
    Let the bike cool completely. Never open the radiator cap when the engine is hot—the system is pressurized and hot liquid can cause burns.
  2. Access the Radiator
    Remove the seat for easier access. Depending on your setup, you may also need to remove the side panels that cover the radiator area.
  3. Drain the Coolant
    Position your drain pan under the bike. Locate the coolant drain bolt at the bottom of the water pump—for the Beta 390 RR, this is usually on the lower left side of the engine case.
    Loosen and remove the bolt, allowing the coolant to fully drain. Also remove the radiator cap to speed up draining.
    Note: The system's capacity is approximately 1.3 liters for the Beta 390 RR1.
  4. Flush (Optional but Recommended)
    To ensure all residual coolant and contaminants are removed, briefly flush the system with distilled water. Pour in clean water and allow it to drain out completely.
  5. Reinstall Drain Bolt
    Replace and tighten the drain bolt securely.
  6. Fill with New Coolant
    Using a clean funnel, pour new coolant into the radiator until it reaches the base of the filler neck. Install the radiator cap.
  7. Bleed Air from the System
    Start the engine and let it idle with the radiator cap off to purge trapped air. As the coolant begins to circulate and the thermostat opens, you may see the level drop—top off as needed. Once it stabilizes, turn off the engine and reinstall the radiator cap.
    Run the bike until it reaches operating temperature, then allow it to cool fully. Recheck the coolant level in both the radiator and overflow reservoir, topping off if necessary2.
  8. Inspect for Leaks
    With the engine off and cool, inspect all coolant lines, drain bolt, and the radiator area for leaks.

2023 Beta 390 RR Model-Specific Notes

  • Integrated Sensor: The Beta 390 RR's fan sensor is already built into the cylinder head, eliminating the need for external adapters when installing or servicing the radiator fan system.
  • Coolant Recommendation: This model's liquid-cooled engine features an aluminum head; always use a coolant safe for aluminum engines to avoid corrosion and maximize performance.
  • Capacity: The system holds about 1.3 liters of coolant. Do not overfill.
  • Maintenance Interval: Many owners opt to change coolant annually for peace of mind, especially for bikes used in extreme conditions.
  • Overflow Tank: Monitor your overflow bottle after a heat cycle. After a complete cool-down, the level may drop slightly as trapped air escapes—this is normal and should only occur once or twice.

Expert Tips

  • Use only high-quality coolant designed for modern motorcycles.
  • Dispose of used coolant responsibly—never pour it down a drain or onto the ground.
  • Check hoses and clamps for signs of wear or aging during service.

Keeping your 2023 Beta 390 RR cooling system fresh enhances reliability and performance wherever the trail takes you. For all parts and accessories, trust MotoSport for genuine and aftermarket options tailored to your ride.

<.-- Sources: 1. 2020 Beta RR 4-Stroke Service Manual 2. Expert walkthroughs and best-practices for coolant bleed and refill procedures -->

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.